Top Two Wire Thermostat Wiring Diagram Robertshaw Thermostat Wiring Diagram Totaline Stunning 2 Wire On - Going into your furnace may additionally sound intimidating, however when you have the basic know-how of wiring, and realize the way to dispose of the right furnace panels to get admission to the electronics, then you must be satisfactory. The com 24v terminal might be connected to the c (24 vac commonplace) of the thermostat. In a scenario wherein the authentic thermostat wires may additionally had been stapled to an indoors wall stud, and not run through conduit, you will be better off leaving the existing set of wires, and slicing them off on the entry and exit factors of the wall. Then feed new wires with a fish tape (klein equipment). Check your neighborhood home improvement shops, or neighborhood tool condominium, for rental availability. Some programmable thermostats (e.G. Honeywell prestige wiring requirements) want a minimum of five wires, and maybe extra relying on what functions you want to operate (humidifier, and many others). The extra fifth wire might be for not unusual; supplying stepped down strength from a transformer. Be aware: a previous installer can also have used a exclusive set of color wires. This can be a non difficulty to hold song of if a whole new set of thermostat wires is pulled. In any other case tag the wires earlier than doing away with from the existing thermostat, or be aware of the terminals every twine is attached to. A: in case you plan to improve to a brand new thermostat make sure you have the proper variety of wires available, otherwise your new thermostat won’t work (maximum advanced honeywell thermostats require a not unusual (c) twine to strength on). In case you do need extra wires, you'll need to do not forget how tough installing new wires can be for your software, and in case you want to price range for an electrician or hvac tech to install the right wiring.